WO2021009675A1 - Bague et bouchon de préforme pour récipient pour des boissons - Google Patents

Bague et bouchon de préforme pour récipient pour des boissons Download PDF

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Publication number
WO2021009675A1
WO2021009675A1 PCT/IB2020/056604 IB2020056604W WO2021009675A1 WO 2021009675 A1 WO2021009675 A1 WO 2021009675A1 IB 2020056604 W IB2020056604 W IB 2020056604W WO 2021009675 A1 WO2021009675 A1 WO 2021009675A1
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WO
WIPO (PCT)
Prior art keywords
closure
diameter
preform
neck
thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2020/056604
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English (en)
Inventor
Vinay Kumar Agarwal
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Vinlabindia Innovations LLP
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Vinlabindia Innovations LLP
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Filing date
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Publication of WO2021009675A1 publication Critical patent/WO2021009675A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/14—Making preforms characterised by structure or composition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B29C2949/0772—Closure retaining means
    • B29C2949/0773—Threads
    • B29C2949/0774—Interrupted threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—Diameter
    • B29C2949/0821—Diameter of the lip, i.e. the very top of the preform neck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—Diameter
    • B29C2949/0822—Diameter of the neck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—Diameter
    • B29C2949/0823—Diameter of the threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—Diameter
    • B29C2949/0824—Diameter of the tamper-evident band retaining ring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—Diameter
    • B29C2949/0825—Diameter of the flange
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0861—Other specified values, e.g. values or ranges
    • B29C2949/0872—Weight

Definitions

  • the present invention relates to bottling of foods.
  • it relates to a container preform and a closure, for sealing a variety of carbonated beverages.
  • Useful packaging designs are those that provide the required light weight and functional performance at a reasonable cost for the target application.
  • the cost of a packaging design is in part determined by the materials of construction and the processing required creating the packaging design.
  • the inventor has perceived a need for a package of a PCO (1810, 1815, 1816, 1820, 1823 and 1881 etc.) neck finish improved PET container and a re-sealable closure for sealing a variety of beverages.
  • a preform used in making of containers for packaging liquids comprises of a neck and a closure, wherein the neck has: a thread major diameter (T) of 20.90 mm; a thread minor diameter (E) of 18.00 mm; and a thread height (T-E/2) of 1.45 mm.
  • the preform neck also has a neck inner diameter (C) of 15.80 mm; a neck wall thickness (i.e., E Wall (E-C/2) of 1.10 mm; and a neck length (X) of 15.50 mm.
  • the preform neck also has a support ring diameter (Z) of 22.60 mm; a thread starting (S) of 1.60 mm; and a lock ring height (D) of 10.40 mm.
  • the preform neck also has a thread pitch (P) of 2.30 mm; a neck outer diameter at top (G) of 18.50 mm; and a lock ring diameter (A) of 21.50 mm.
  • the preform neck also has a diameter below lock ring (B) of 18.3 mm; a height above support ring (H) of 14.44 mm; and 700-900 degrees of preform neck finish thread turns.
  • the preform neck also has730- 900 degrees of closure thread turn; a preform neck finish weight of 1.95 grams; and a closure weight of 1.36 or 1.38 grams for a single piece or a two-piece closure.
  • the preform with improved neck characterizes to form an improved Polyethylene Terephthalate (PET) container which is re- sealable as to hold a variety of liquids apart from all the carbonated soft drinks.
  • PET Polyethylene Terephthalate
  • the preform with improved neck characterizes to form a plurality of Plastic Closure Only (PCO)finish of 1810, 1815,1816,1820,1823, 1881 and the like.
  • PCO Plastic Closure Only
  • the preform with improved neck and its closure reduces weight of polymer of the container while packaging carbonated soft drinks with enhanced performance.
  • the preform is ambient at 175 PSI for 240 seconds and release test at 200 PSI for 180 seconds.
  • the preform has higher carbonation up to 5% by weight.
  • a closure that is used for closing the containers for packaging liquids.
  • the closures comprise: a thread major diameter (T) of 21.00 mm; a thread minor diameter (E) of 19.50 mm; and a thread height (T-E/2) of 0.75 mm.
  • the closure also comprises of an outer diameter at top (C) of 22.90 mm; an inner diameter at top (X) of 20.80 mm; and an outer locking diameter (Z) of 16.10 mm.
  • the closure also comprises of an inner locking diameter (Zl) of 14.20 mm; a middle locking diameter (Z2) of 15.60 mm; and a thread starting (S) of 3.6 mm.
  • the closure also comprises of an inside lock ring height (D) of 10.00 mm; a thread pitch (P) of 2.30 mm; and an outer diameter at bottom (G) of 24.20 mm.
  • the closure also comprises of a lock ring diameter (A) of 22.80 mm; an inner diameter length at bottom (B) of 2.64 mm; and a height above support ring (H) of 14.20 mm.
  • the closure also comprises of a folding length (L) of 2.60 mm; an outside locking diameter (Y) of 18.30 mm; and an outside locking height (Yl) of 1.90 mm.
  • the closure also comprises of a top sealing diameter (K) of 17.10 mm; closure thread turns of 730 to a maximum of 900 degrees; 110 number of serrations; and a finish weight of 1.36 or 1.38 grams for a single piece or a two piece closure.
  • K top sealing diameter
  • the preform could have a two -piece closure.
  • the single piece closure or the two piece closure does not allow the liquids packed in it to leak at 171 PSI (12 kg/cm2) even after 240 seconds and wont not release at 200 PSI (14 kg/cm2) for 180 seconds.
  • the single piece closure is formed with a special grade of High-Density Polyethylene (HDPE) which has a Melt Flow Rate (MFR)less than 2.
  • HDPE High-Density Polyethylene
  • MFR Melt Flow Rate
  • the two-piece closure is formed of a special grade of Polypropylene (PP) which will have a Melt Flow Rate (MFR)less than
  • the two-piece closure also comprises a liner is made of Poly Vinyl Chloride (PVC) free and Ethylene-co-Vinyl Acetate (EVA) blend.
  • a process of manufacturing PET preforms involves steps of drying of PET as the first step. Because PET is hygroscopic, it must be dried before it can be injected. The maximum amount of water that can be in the resin when it is in the extruder throat is 50 ppm. This residual moisture will react with the PET in the extruder and lead to an acceptable drop of 0.03-0.04 in IV. Higher moisture levels will lead to much higher IV drops, rendering the material unsuitable for the application.
  • the correct drying parameters are a combination of time and temperature at a certain airflow. Modern dryers are able to generate the required air flow of 4 m3/h/kg h (1 cfm/lb h). Under these conditions, processors must calculate or determine by practical experiment what the residence time of the resin in the hopper is for a given job. To do this practically, a handful of color pellets are placed on top of the resin in the hopper with the time noted. The color pellets will eventually show up in the preform, and the time can then be measured. Depending on the position of the resin in the hopper, drying times differ with the resin in the center of the hopper traveling up to 20% faster.
  • a median residence time must be chosen. Once this residence time has been established (generally it is 4-6 hours), the proper drying temperature can be chosen. Maximum drying temperature is 171 °C (340 °F). Higher temperatures lead to oxidation, which shows up as yellowing of the resin. Improper drying and the resultant drop in change the inflation behavior of the preform in that the preform will inflate under lower pressure because the NSR is greater. In turn, this will lead to less orientation and weaker bottles.
  • the PET preform manufacturing process involves injection moulding of Preforms.
  • Injection moulds consist of the male core, the female cavity, and the neck insert. The last has to move during ejection of the part to release the undercuts created by the thread beads.
  • the neck inserts are mounted on slides that are often cam driven. Cores and cavities are always water-cooled, whereas neck inserts may or may not be water-cooled.
  • the injection moulding of Preforms is different from other forms of injection moulding as the preform wall is relatively thick, injection pressures are relatively low, and the injection speed is low to prevent shearing of the material.
  • the injection begins with the tool closed, forming an empty cavity.
  • the material enters the cavity through the gate.
  • the resin in direct contact with the wall freezes off and forms a boundary layer.
  • the material in this layer will not change during injection. Its thickness restricts the mould channel and is one reason why a minimum wall thickness must be maintained in the preform gate area.
  • the boundary layer expands along the length of the preform. Its thickness stays the same as long as hot material is flowing through.
  • the air that is present in the mould cavity must have an escape path. Otherwise, trapped air would lead to sink marks in the preforms. Four to eight vents approximately 0.01-0.015 mm deep are machined into the face area of the preform neck, allowing air to vent to the outside. Sink marks are also prevented, and the flow of material is improved by giving cores a finish in the direction of material flow rather than radially.
  • a process of closure manufacturing includes selection of either injection or compression moulded.
  • injection moulding includes using one male core and one female cavity for each closure produced per cycle. These are mounted in configurations of multi-cavity tools up to 192 cavities with most moulds in the 24- to 64-cavity range.
  • Plastic pellets are fed into the machine via a hopper. If colored closures are to be produced, the resin may be pre-colored or, more likely, color is fed just underneath the hopper into the resin stream in ratios of 0.5— 4%.
  • the resin is then taken by a rotating extrusion screw and melts under the combined effects of friction and heat.
  • the screw both melts the resin and injects it into the tool.
  • the screw turns and moves backward. Once enough material is in front of the screw, the screw stops and injects the melt into the closed tool after the closures made in the previous shot have been ejected.
  • Screw size must be chosen so that screw recovery time is shorter than cooling time plus tool moving time. This is to ensure that the machine does not have to wait for screw recovery to finish before starting the next cycle.
  • a suitable check valve sits at the end of the screw closest to the mould. It allows material to pass to the front of the screw during recovery but prevents material from moving back during injection.
  • compression moulding for making of closures is tried.
  • the compression moulding machines work very differently when compared with injection moulding machines. There is of course an extrusion screw, but it is running continuously because the screw has no part in the transfer of the molten plastic into the mould.
  • Single-cavity tools are mounted on a rotary table with practically no limitation as to maximum cavitation (Usually 24-64 cavity).
  • a drop of precisely measured resin, cut from a continuous extruded stream, is placed into a transfer wheel.
  • the same wheel also takes finished closures out of the main wheel.
  • the transfer wheel comes to a position above an empty cavity of the main wheel and drops the plastic into it.
  • the cavity lifts vertically up into the core and the actual moulding takes place.
  • the plastic now spreads between core and cavity, climbing up the closure sidewalls under relatively low pressure.
  • the cavity moves down leaving the closure on the core.
  • a stripper ring pushes the finished closure onto the transfer wheel.
  • An additional transfer wheel then places the finished closures onto a conveyor.
  • the making of closure involves folding and slitting of closure. It starts with a temper band need to be folded which is done in a rotary machine where closure is put in cavity and a top core is pressed to fold the temper band. Next the closure needs slitting to make closure pilfer-proof this also done in a rotary machine and slitting is done with a fine knife, the knife has cuts at certain distance to keep slitted part attached with closure.
  • the closure that is manufactured can be a single piece closure and a two-piece closure.
  • single piece closure the sealing lips is part of closure and moulded as one piece where in two-piece closure sealing lips are not moulded and it is done separately in a liner moulding machine.
  • the method of liner moulding for two-piece closure involves compression moulded with the cap acting as the cavity.
  • a very small drop of suitable plastic is placed directly into the cap from an extruder and the resulting liner bonds with the cap material.
  • the material used in is Poly Vinyl Chloride (PVC) free and Ethylene-co- Vinyl Acetate (EVA) blend.
  • FIGS. 1-3 illustrates the perspective view of the preform neck followed by its side and top views
  • FIG. 4 illustrates the cross-sectional view of the neck at the section A-A
  • FIG. 5a-f illustrates isometric views of a single piece closure with its critical dimensions
  • FIGS. 6 & 7 illustrates the side view and cross-sectional view of the single piece closure at the section G-G;
  • FIG. 8 & 9 illustrates cross sectional bottom view at the sections E-E & C-C respectively;
  • FIGS. 10A & 10B illustrates the cross-sectional front view and the side view of the final assembly of the single piece closure after slitting and folding.
  • FIG. 11 illustrates the zoomed view of the detail F with its dimensions
  • FIG. 12 illustrates the cross-sectional front view of the final single piece closure after slitting and folding
  • FIG. 13 illustrates the perspective view of the two-piece enclosure
  • FIGS. 14 & 15 illustrates the side view and cross-sectional view of the two-piece closure at the section G-G;
  • FIGS. 16 &17 illustrates the cross-sectional view at the section A- A along with the zoomed view of detail A;
  • FIGS. 18 & 19 illustrates the bottom view and its cross-sectional view at the section B-B;
  • FIGS. 20 & 21 illustrates the top view of the two-piece enclosure and the detail B showing the serrations;
  • FIGS. 22 & 23 illustrates the details C and D from the cross-sectional view at section A-A;
  • FIG. 24 illustrates the Liner for the two-piece enclosure to effect sealing between the closure and the container
  • FIG. 25 illustrates the cross-sectional view of the final two-piece closure after liner slitting and folding
  • FIGS. 26 & 27 illustrates the cross-sectional view of neck and closure assembly and zoomed view of the detail A;
  • FIG. 28 illustrates the perspective view of the neck and closure assembly
  • FIGS. 29 - 31 illustrates the front view of the assembly followed by its bottom view
  • the preform comprises of a neck and a closure, wherein the neck (100) has: a thread major diameter (102) T of 20.90 mm; a thread minor diameter (104) E of 18.00 mm; and a thread height (106) (T- E/2) of 1.45 mm.
  • the Preforms neck (100) has a neck inner diameter (108) C of 15.80 mm; a neck wall thickness (109) (i.e., E Wall (E-C/2) of 1.10 mm; and a neck length (110) X of 15.50 mm.
  • the Preforms neck (200 & 400) has a support ring diameter (112) Z of 22.60 mm; a thread starting (413) S of 1.60 mm; and a lock ring height (114) D of 10.40 mm.
  • the Preforms neck (100) has a thread pitch (415) P of 2.30 mm; a neck outer diameter at top (116) G of 18.50 mm; and a lock ring diameter (117) A of 21.50 mm.
  • the preforms neck (100) has a diameter below lock ring (118) B of 18.3 mm; a height above support ring (119) H of 14.44 mm; and 700-900 degrees of preform neck finish thread turns (111).
  • the preforms neck (100) has 730-900 degrees of closure thread turns (522 & 1322); a preform neck finish weight of 1.95 grams; and a closure weight of 1.36 or 1.38 grams for a single piece or a two piece closure.
  • the preform with improved neck (100) characterizes to form improved Polyethylene Terephthalate (PET) containers which are re-sealable as to hold a variety of liquids apart from all the carbonated soft drinks.
  • PET Polyethylene Terephthalate
  • the preform with improved neck (100) characterizes to form a plurality of Plastic Closure Only (PCO) finish of 1810, 1815,1816,1820,1823, 1881 and the like.
  • PCO Plastic Closure Only
  • the preform with improved neck (100) and its closure (500) reduces weight of polymer of the container while packaging carbonated soft drinks with enhanced performance.
  • the preform could have a two-piece closure (1330).
  • the single piece closure (500) or the two piece closure (1330) does not allow the liquids packed in it to leak at 171 PSI (12 kg/cm2) even after 240 seconds and wont not release at 200 PSI (14 kg/cm2) for 180 seconds.
  • the single piece closure (500) is formed with a special grade of High-Density Polyethylene (HDPE) which has a Melt Flow Rate (MFR)less than 2.
  • HDPE High-Density Polyethylene
  • the two-piece closure (1330) is formed of a special grade of Polypropylene (PP) which will have a Melt Flow Rate (MFR)less than 9.
  • PP Polypropylene
  • MFR Melt Flow Rate
  • the two-piece closure (1330) also comprises a liner (2435) is made of Poly Vinyl Chloride (PVC) free and Ethylene-co-Vinyl Acetate (EVA) blend.
  • PVC Poly Vinyl Chloride
  • EVA Ethylene-co-Vinyl Acetate
  • FIGS. 1-3 illustrates the perspective view of the preform neck (100) followed by its side (200) and top views (300).
  • the preform neck (100) with the dimensions of a thread major diameter (T) (102) of 20.90 mm, a thread minor diameter (E) (104) of 18.00 mm; a thread height (T-E/2) (106) of 1.45 mm, a neck inner diameter (C) (108) of 15.80 mm; a neck wall thickness(109)i.e., E Wall (E-C/2) of 1.10 mm; and a neck length (X) (110) of 15.50 mm.
  • T thread major diameter
  • E thread minor diameter
  • C neck inner diameter
  • X neck length
  • the preform neck (100) measures about 700-900 degrees of finish thread turns (111) with a finish weight of 1.95 grams.
  • FIG. 4 illustrates the cross-sectional view of the neck (400) at the section A-A.
  • the section is cut horizontally at A and the dimensions of the thread pitch (P) (415) is obtained as 2.30 mm and the radius of each thread is measured as 0.30, and the start distance (413) of the neck (S) (100) is 1.60 mm.
  • FIG. 5a-f illustrates isometric views of a single piece closure with its critical dimensions.
  • the single piece closure (500) is manufactured from a special grade of High- Density Polyethylene (HDPE) that has less than 2 Melt Flow Rate (MFR).
  • the closure (500) is first moulded by Injection moulding machine. After moulding, the closure (500) is then folded and silted in a separate machine to make it temper evident.
  • the closure (500) has 730- 900 degrees of thread turns (522).
  • the closure weighs around 1.36 grams.
  • the closures (500) comprises a thread major diameter (T) (523) of 21.00 mm; a thread minor diameter (E) (525) of 19.50 mm; a thread height (T-E/2) (526) of 0.75 mm; an outer diameter at top (C) (528) of 22.9 mm; an inner diameter at top (X) (532) of 20.8 mm; an outer locking diameter (Z) (534) of 16.10 mm; an inner locking diameter (Zl) (536) of 14.20 mm; a middle locking diameter (Z2) (538) of 15.60 mm; a thread starting (S) (540) of 3.6 mm; an inside lock ring height (D) (542) of 10.00 mm; a thread pitch (P) (544) of 2.30 mm; an outer diameter at bottom (G) (546) of 24.20 mm; a lock ring diameter (A) (548) of 22.80 mm; an inner diameter length at bottom (B)
  • FIGS. 6 &7 illustrates the side view and cross-sectional view of the single piece closure (620) at the section G-G. As shown in FIGS. 6 & 7, the section is cut vertically along G-G and the dimensions measured from the cross section are, the entire closure diameter of 23.50 mm, major closure radius is 10.24 mm.
  • FIG. 8 illustrates the bottom view of the single piece closure (820). As shown in FIG. 8, the closure is sectioned at E-E and C-C and the dimensions are shown. FIGS. 9 illustrates cross sectional view at the sections E-E & C-C respectively and the corresponding dimensions are displayed.
  • FIGS. 10A&10B illustrates the cross-sectional front view and the side view of the final assembly of the single piece closure after slitting and folding.
  • FIG. 11 illustrates the zoomed view of the detail F with its dimensions.
  • FIG 12 illustrates the cross-sectional front view of the final single piece closure (1224) after slitting and folding. After, the moulding process, the closure (1224) is folded and silted in a separate machine so as to make it temper evident.
  • FIG. 13 illustrates the perspective view of the two-piece closure (1330).
  • the two-piece closure (1330) is manufactured from a special grade of Polypropylene (PP) which has less than 9 melt flow rate (MFR).
  • PP Polypropylene
  • MFR melt flow rate
  • the two-piece closure (1330) is also moulded by Injection moulding machine initially and then the closure is folded and slitted in a separate machine to make it temper evident.
  • the weight of the two-piece closure (1330) is 1.98 grams.
  • FIGS 14-23 illustrates the different perspective and cross-sectional views of the two-piece closure (1330) at various sections like G-G, A-A and B-B and various zoomed views for the better detailing of the closure elements.
  • FIG. 24 illustrates the Finer (2435) for the two-piece enclosure (1330) to affect sealing between the closure (1330) and the container.
  • the liner (2435) is made of PVC free EVA Bland and is moulded separately in a compression moulding machine and is then arranged to the closure after its final silting and folding.
  • the liner (2435) thickness is 2.0mm and its major diameter is 20.7 mm whereas its minor diameter is 13.9 mm.
  • FIG. 25 illustrates the cross-sectional view of the final two-piece closure (2530) after liner (2535) slitting and folding.
  • the two-piece closure (2530) has the length of 14.20 mm and the diameter is of 24.20 mm.
  • FIGS. 26 to 31 illustrate the assembly (2650) of neck and closure and their corresponding views at sections A-A and B-B.
  • the closure due to its unique double lip design and closure wall thickness between threads 1.33 m and in slot area 0.75 mm, when the C02 pressure is developed and tries to escape out, the counter pressure is generated and the C02 is not able to release from the container.
  • a process of manufacturing PET preform involves steps of drying of PET as the first step. Because PET is hygroscopic, it must be dried before it can be injected. The maximum amount of water that can be in the resin when it is in the extruder throat is 50 ppm. This residual moisture will react with the PET in the extruder and lead to an acceptable drop of 0.03-0.04 in IV. Higher moisture levels will lead to much higher IV drops, rendering the material unsuitable for the application.
  • the correct drying parameters are a combination of time and temperature at certain airflow. Modern dryers are able to generate the required airflow of 4 m3/h/kg h (1 cfm/lb h). Under these conditions, processors must calculate or determine by practical experiment what the residence time of the resin in the hopper is for a given job. To do this practically, a handful of color pellets are placed on top of the resin in the hopper with the time noted. The color pellets will eventually show up in the Preforms, and the time can then be measured. Depending on the position of the resin in the hopper, drying times differ with the resin in the center of the hopper travelling up to 20% faster.
  • a median residence time must be chosen. Once this residence time has been established (generally it is 4-6 hours), the proper drying temperature can be chosen. Maximum drying temperature is 171 °C (340 °F). Higher temperatures lead to oxidation, which shows up as yellowing of the resin. Improper drying and the resultant drop in change the inflation behavior of the preform in that the preform will inflate under lower pressure because the NSR is greater. In turn, this will lead to less orientation and weaker bottles.
  • the PET preform manufacturing process involves injection moulding of Preforms.
  • Injection moulds consist of the male core, the female cavity, and the neck insert. The last has to move during ejection of the part to release the under cuts created by the thread beads.
  • the neck inserts are mounted on slides that are often cam driven. Cores and cavities are always water-cooled, whereas neck inserts may or may not be water-cooled.
  • the injection moulding of Preforms is different from other forms of injection moulding as the preform wall is relatively thick, injection pressures are relatively low, and the injection speed is low to prevent shearing of the material.
  • the injection begins with the tool closed, forming an empty cavity.
  • the material enters the cavity through the gate.
  • the resin in direct contact with the wall freezes off and forms a boundary layer.
  • the material in this layer will not change during injection. Its thickness restricts the mould channel and is one reason why a minimum wall thickness must be maintained in the preform gate area.
  • the boundary layer expands along the length of the preform. Its thickness stays the same as long as hot material is flowing through.
  • the air that is present in the mould cavity must have an escape path. Otherwise, trapped air would lead to sink marks in the preforms.
  • vents approximately 0.01-0.015 mm deep are machined into the face area of the preform neck, allowing air to vent to the outside. Sink marks are also prevented, and the flow of material is improved by giving cores a finish in the direction of material flow rather than radially.
  • the added resistance causes the hydraulic pressure to increase, and it is here that the machine needs to be switched from injection to hold or packing pressure. This can be done by using the actual pressure as the setting to trigger the hold pressure, but for PET a position-based trigger has proven to be more consistent and is therefore used almost exclusively. The point at which this occurs is called the transition or switchover point.
  • material that is now starting to shrink as it cools is replaced through the still open center of the melt stream.
  • a process for the said closure manufacturing includes selection of either injection or compression moulded.
  • injection moulding includes using one male core and one female cavity for each closure produced per cycle. These are mounted in configurations of multi-cavity tools up to 192 cavities with most moulds in the 24- to 64-cavity range.
  • Plastic pellets are fed into the machine via a hopper. If colored closures are to be produced, the resin may be pre-colored or, more likely, color is fed just underneath the hopper into the resin stream in ratios of 0.5— 4%.
  • Screw size must be chosen so that screw recovery time is shorter than cooling time plus tool moving time. This is to ensure that the machine does not have to wait for screw recovery to finish before starting the next cycle.
  • a suitable check valve sits at the end of the screw closest to the mould. It allows material to pass to the front of the screw during recovery but prevents material from moving back during injection.
  • compression moulding for making of closures is tried.
  • the compression moulding machines work very differently when compared with injection moulding machines. There is of course an extrusion screw, but it is running continuously because the screw has no part in the transfer of the molten plastic into the mould.
  • Single-cavity tools are mounted on a rotary table with practically no limitation as to maximum cavitation (Usually 24-64 cavity).
  • a drop of precisely measured resin, cut from a continuous extruded stream, is placed into a transfer wheel.
  • the same wheel also takes finished closures out of the main wheel.
  • the transfer wheel comes to a position above an empty cavity of the main wheel and drops the plastic into it.
  • the cavity lifts vertically up into the core and the actual moulding takes place.
  • the plastic now spreads between core and cavity, climbing up the closure sidewalls under relatively low pressure.
  • the making of closure involves folding and slitting of closure. It starts with a temper band need to be folded which is done in a rotary machine where closure is put in cavity and a top core is pressed to fold the temper band. Next the closure needs slitting to make closure pilfer-proof this also done in a rotary machine and slitting is done with a fine knife, the knife has cuts at certain distance to keep slitted part attached with closure.
  • the closure that is manufactured can be a single piece closure and a two-piece closure.
  • single piece closure the sealing lips is part of closure and moulded as one piece where in two-piece closure sealing lips are not moulded and it is done separately in a liner moulding machine.
  • the method of liner moulding for two-piece closure involves compression moulded with the cap acting as the cavity.
  • a very small drop of suitable plastic is placed directly into the cap from an extruder and the resulting liner bonds with the cap material.
  • the material used in is Poly Vinyl Chloride (PVC) free and Ethylene-co-Vinyl Acetate (EVA) blend.
  • a new Preform Neck (100) and closure (500 & 1330) with change in neck size for CSD application all the other dimensions should be developed independently to get the required result. There will be no relevance with present available neck and closure design and dimensions. In other words, every new neck and closure is unique. The change in neck size has no relevance with dimensions of other necks and they are not proportionate or same. Every radius and angles need to be designed independently.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Manufacturing & Machinery (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une préforme utilisée en fabrication de récipients pour le conditionnement de liquides. Le col (100) amélioré des préformes est caractéristique pour former des récipients en poly(téréphtalate d'éthylène) (PET) améliorés qui peuvent être refermés de façon étanche de manière à contenir un grand nombre de liquides à l'exception de toutes les boissons gazeuses sans alcool. Le col (100) amélioré des préformes est caractéristique pour former une pluralité de bagues de bouchon en plastique uniquement (PCO) de 1810, 1815, 1816, 1820, 1823, 1881 et similaires. Le bouchon (500 or 1330) des préformes réduit le poids du polymère du récipient tout en conditionnant des boissons gazeuses sans alcool avec des performances accrues. La préforme est ambiante à 175 PSI pendant 240 secondes et un essai de libération à 200 PSI pendant 180 secondes. La préforme a un taux de carbonatation plus élevé allant jusqu'à 5 % en poids.
PCT/IB2020/056604 2019-07-15 2020-07-14 Bague et bouchon de préforme pour récipient pour des boissons Ceased WO2021009675A1 (fr)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1742785B1 (fr) * 2004-04-16 2009-03-04 Advanced Plastics Technologies Luxembourg S.A. Preforme et procedes de fabrication desdit preforme et une bouteille

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1742785B1 (fr) * 2004-04-16 2009-03-04 Advanced Plastics Technologies Luxembourg S.A. Preforme et procedes de fabrication desdit preforme et une bouteille

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